Dodgy reflashed Phone from eBay, how to maintain safety?

Posted 22nd Jul 2021
I bought an "open box 14 day return" phone from a seller on ebay - miandmore - with the current 20% code.

On arrival, the Huawei Nova 5T I had bought revealed itself to have Magic OS and say it was up to date which I thought was weird, set it up but then released the phone actually think it is a Honor 20 (the twin sister phone)

I'm factory resetting and returning, but anyone know of whether there are any extra steps I should take in case of anything more sinister than a rubbish flash of the OS has been done?

Will not be using that seller ever again...
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